Doweling jig



July 24, 1951 R. F. DOUGLASS DOWELING JIG FiledJan. 12, 1950 3nnentor attorney Patented July 24, 1951 DOWELING JIG Robert F. Douglass, Omaha, Nebr. Application January 12, 1950, Serial No. 138,20lL

3 Claims. (Cl; 77-62) This invention relates to craftsmans tools or implements, having reference to that class of devices known as doweling jigs which are designed foruse in gauging and'forming dowel-pin ;-.ioints between the parts of furniture manufacturesisuch as cabinets and the like. 4 ,Anobject of the invention is primarily to provide means by' which the individual cabinetmaker or other article constructing craftsman engaged in small picce-work business can econ'omically compete with the larger business man- --ufacturer in the making of high-grade furniture and, other dowelled manufactures, by considerably reducing the amount of work and time necessary to form proper joints between the parts eof such structuresto b'e fitted together, it being well-known that the ordinary craftsman lacking costly machinery and other essential facilities for quantity production is obliged to charge relatively high prices for the labor of hisihand work requiring great precision and care.

Another object is to provide a dowelling jig which is easily manipulatable and is adaptable '-to almost any edge or surface upon which a joint @is to be made, regardless of its angle or extent.

Another purpose is to provide a tool with which to secure an accurate alignment of dowels in the joints or between the parts of any material susceptible ofbeingd'rilled'by standard twist drills and, in cases such as wood wherethere is a distinct grain, to effect joints with the component parts disposed in a direction with, against, or angularly to the grain, or in combinations of these relationships. v

L Still another object of the invention is to provide a device for the purpose described which is sturdy and durable in construction, reliable and efhcient in operation, and relatively simple and inexpensive to manufacture, assemble, and utilize.

Other and still further objects and advantages of the invention will become apparent from the following detailed description of a preferred embodiment thereof.

In the drawings:

Figure 1 is a side elevation of the new device in a position of use on a piece of lumber or the like, the latter being shown by means of dotted lines.

Figure 2 is a bottom plan View of the new device shown in Figure 1.

Figure 3 is a right side view of the device as shown in Figure 2.

In Figure 1 a piece of wood or the like is indicated in dotted lines at l0, and it is desired to UNITED STATES PATENT OFFICE j 2 drill a dowel pin hole in the surface H wood Ill.

To do this, a guide plate I2 of the invention is held in place on the surface i3, and if desired may be clamped to the said surface depending on the skill of the craftsman using the tool. The uide plate 12 is rectangular in plan, and is preferably formed of steel.

The guide plate I2 is pivotally attached to a narrow side of a C shaped member or base I4, best seen in Figure 3, by a bolt l5, the latter being set inwardly of the downward bearing surface of the plate I2 so as not to mar the surface of the wood being drilled. The c shaped member is rectangular in end elevation and is proof the vided with a channel I B for receiving snugly, and

slidably therein an elongated, fiat guide bar iii of any desired length.

' The guide bar or attachment member 13 is held in the channel It by a shield 20, said shield being attached to the C shaped member by means of machine screws or thelike 2|, which hold the guide bar l8 in a line of parallelism with the plane'of the bottom surface of guide plate l2.

At the right end of the guide bar I8 and disposed at a right angle thereto, is an adjustable through an aperture in the bar and through the slot 30. A lock washer 36 and a nut 38 are disposed on the bolt 34 for holding the arm 25 in a rigid position with respect to the bar i 8.

The slot 30, aperture 35, and pin 32 are disposed in a line at a right angle to the bearing surface of the member I2.

Attached to the other end 26 of the arm 25 is a shaft housing 4!], constructed in such a way that it may be attached to the end portion 26 of the arm 25 by machine screws or the like 3| and 33. The housing 40 is provided with a bushing 42 providing a bearing for rotatably supporting a threaded shaft 44. Threadedly disposed on the forward end of the shaft 44 is a chuck 46 for locking a bit 48 in axial alignment with the shaft 44.

The shaft 44 has a rearward end portion of a lesser diameter. The end portion 45 is received in a chuck 5G, depicted in dotted lines in Figure 1, of a power actuated drill, for transmitting power to rotate the bit 48.

As thus described it will be seen that the plate I? may be located and clamped, handled or otherwise be held in place on the surface 13 of the wood It]. The support arm 25 is then adjusted to properly locate the bit 48 into desired position on the surface I.

At this time the rotating bit as, supported rigidly, but slidably and rotatably by the bar I8, is moved against and into the surface 1 i of the piece of wood ill for drilling the dowel pin hole with great precision, speed, and accuracy.

From the foregoing description it is thought to be obvious that a doweling jig constructed in accordance with my invention is particularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated and it will also be obvious that my invention is susceptible of some change and modification without departing from the principles and spiritthereof, and for this reason I do not wish to-be understood as limiting-myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice, except as claimed.

I claim:

1. A doweling jig comprising a flat plate having a work piece engaging face, a base having a channel parallel to said work piece engaging face extended therethrough positioned on the side of the plate opposite to that on which the work piece engaging face is positioned, a guide bar slidably mounted in the channel of the base, a guide pin carried by anend of the guide bar, a'clamp bolt also carried by the end of the guide bar on which the guide pin is positioned and mounted in a plane extended through the said guide pin and perpendicular to the longitudinal edges of the said guide bar, a support arm having a bearing housing on one end and an elongated slot extended inwardly from the opposite end positioned on the guide bar with the guide pin and clamp bolt in the slot thereof, and a shaft having a tool carrying chuck on one end journaled in said bearing-housing with the axis thereof parallel to the said work engaging face ofthe plate and positioned with the end thereof opposite to that on which the chuck is carried extended for engagement with power driving means.

2. In a doweling jig, the combination which comprises a plate having a work piece engaging face," a base having a channel parallel to said work piece engaging. face extended therethrough pivotally mounted on the plate and positioned on the side opposite to that on which the work 4 piece engaging face is positioned, a guide bar slidably mounted on the base and extended through the channel therein, a guide pin carried by the end of the guide bar extended from the base, a clamp bolt also carried by the end of the guide bar extended from the base and positioned in a plane extended through the said guide pin and perpendicular to the longitudinal edges of the said guide bar, a support arm having a bearing housingon one endia nd anelongated slot extended. inwardly from the opposite end positioned on the guide bar with the guide pin and clamp bolt in the slot thereof, and a shaft journaled in the bearing housing positioned parallel to the work piece engaging face of the plate andhaving a tool carrying chuck on the end thereof extended. toward the plate, the opposite end of face, a bolt pivotally. mounting the base on the SideLof the plate; opposite. to that. onwhich the workpiece engaging. face is positioned and with the channel therein parallel to the said face, a shield secured to'the base and providing'a cover plate forthe channeLa guide bar slidably mounted in the channel of the base and extended therefrozrna guide pin carried by the end of the guide bar extended from the base, a clamp bolt also carried by the end of the'guide bar extendedfrom the base 1 and positioned in a plane extended through the guide pin and perpendicular .to the 'l'ongitudinaledges'of the said guide bar, asupport arm having a bearing housing on one'end and an elongated slot extended inwardly from the opposite end positioned on the guide barv with'the guide pin andclamp bolt in the said slot'thereof, and. a shaft'journaled in the bearing housing positioned parallel to the workpiece engaging face of the plate and having a tool carryingchuck 'on the end thereof extended toward the plate, the opposite end of the saidshaft extendedfor engagement with the chuck of a power driving tool.

ROBERT F. DOUGLASS.

REFERENCES CITED The-following references are of record'in the file-of this patent:

UNITED STATES PATENTS 

